#include <stdio.h>
int main()
{
    int a,b,c,max;
    printf("please import a,b,c:");
    scanf("%d,%d,%d",&a,&b,&c);
    max=a;
    if(b>max)max=b;
    if(c>max)max=c;
    printf("%d\n", max);
    return 0;
}
